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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75511cb687f73c6c3b0a46ab6c5a08763a9ae1fa7db843e4e59e75cd8c8c16f' 
  AND token = 'mnYL0PJD0sxLrIUMm+Vo+KBC98K69g2FP1glLOgRPvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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