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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb8bf7268b81d54bdf4d65ee89d7e00a4a19b9bb42891c49b7596d9edde5ee6' 
  AND token = 'W+L6OEHj++eLh5rBHqdvy9aVDa4NxopqFeAJr1d6q+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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