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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e305010bc5ad36f107332d339c652af299ea0c4c47b18724cd6d7f485717d141' 
  AND token = 'KUEeOycITtpSsmKSVy+wlyii5zn0HqZ93if9IV17l84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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