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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b33495d5e8eec95a42f8d631021bb9335b36c0306f0276df9e83feb59a09ff' 
  AND token = 'p6h6HHJlZRNv7K5/rCMXSduFsbb6ZTVCECsS3VD2P5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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