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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4f9cff69d96f459614de9ff46581e1ebba76112ab97e7dc5e1b3d21824e361' 
  AND token = 'ddect7Bg8IlxuJX21iw4tmDIp1ZszF1LNTMRhzML/0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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