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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84d9aca2fd23bdee4c89786e26d47d80160a56b084b4ef460ba8c23d14ba9d0' 
  AND token = 'BeQpGyZPiAMQGOuyWyqAr55V3CjtSd5dRdeBE3iN5Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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