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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d14ac852f2ebc836c5001103b363fff2ef9a1f6efd4423713b2756f1605a7a' 
  AND token = 'o7pViOAVXedy+ovrHO3iIBigTCAcxwgP9Twdt0x6U8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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