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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8984f0f45ea19793f9cfd1a111f096eb4db55ca14c019fc5380bf88f796bf2' 
  AND token = '4Js9I25gO5l/6MeD/TVC5RmomQWsFbGFYfXb9zudvLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00277

JSON explain

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