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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49701ea744c074480fbd6f999529eccace73a99a8ae60db3c01738d73f8054a4' 
  AND token = 'B7bHSdiP0GFhBuMF2Tw9mla9UgT0v0e+nH5TdKut9WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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