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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02041b3fd3a1a3eddb317edc27adab05300a168fd226ec5de7676b3cd370a75' 
  AND token = 'ZxuDZS+JCLWkuiovLHtWOx6fu3j/F0mz8U5EXraaff4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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