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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c04f19bd287b8957b1aac1f829c16ecc8d04fd2d58c666c0d4ca5882767c5a' 
  AND token = 'gSb7nn1v8sHTDcq0PLbPiRzj4r6ixSsEb++3q/a/KH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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