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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056479fb55a4a7d2e4f288471d28d97a80eebaa9d27973ee7d733076af2b7873' 
  AND token = 'eqvRBrY2S3sB3e+HstJTmi/fOL4tYyc3n1lkVbHLWhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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