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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ee7eb967fde19b64f73736791067efeb10c9c208e86f3cdbba8474de580b4a' 
  AND token = 'DYa6tqq5DmEJuY7Cg3tuII/fVDIKu5GMHuthNvRqaqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}