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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8905627d08e7c917bf5b7a55ca80d6df2169d6527fdc6f56ae15b445a2f1d1f0' 
  AND token = 'nlZTquj6buMvHLHkLKoQ+LKSj5pcMXc6l9+7cdA/AQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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