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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ed2dc26f341645906e85106801006dcb5c19a9e78eab32d1a7858ecc8d951a' 
  AND token = 'nz83ISnzzddbCIQt/l+1kFLS4qOy+zhj2/AWk2maJAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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