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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb18d0dc9b87905ab734b4b39f0e13a97246bf10c380c39c6f871ade89df516' 
  AND token = 'S4MKcDhVi+xCO9i/q+ehv0oMdK4Myeu77U3TPA5qJj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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