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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd9f9087cc1c140a3e73d27943034e833fd6a78b8887c9ae59ca159b3f4a26f' 
  AND token = 'dHC06e1gke58fghSMAzfNsubl2hw4K5NUNy1QzexwWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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