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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1aa3c694033609a6c17b146b89184530befaad6c75b9aec9aecb296b1974cf' 
  AND token = '/NyG2WoGb4dCCU5UsAu6aN3cIinowdjlyesWJGrn+ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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