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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74afece8164e8cb810d65c42615a050ca5d46ad53b86bd6806c5bfa6ffac96d' 
  AND token = 'vI3Ryc1ABE5InxYaUY92nqnO2yw+qvHRXFz4YGlG/ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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