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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c1b27514d98f88b34a5366d8f630032039a8be419b094fdb2f89715eb077be' 
  AND token = 'X31m2RZPeSDHwtk5OZvvwqNmksstx9Ywn/GITqi86Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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