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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2a0e83d1f0f01b89623c4ec3a367de405007499440ba07a4c938beee68fdd7' 
  AND token = 'HqvThibTX5qz3pMRKPcWWKOkPZRJ5ayyCb746m8//Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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