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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989ae9f57cf12a2ab3b6ef2c0fb29f5862feff63a777a12cc9f582de9950e796' 
  AND token = 'pE8edh5lBa6I8lDyFk2Dfo9j6nCdiNEy+ODePKhULF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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