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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb57c44f0212effc7882f1ab1f72aafd62f8bc5b1e1c9557e3c24716d89edd12' 
  AND token = 'ZkHjsoe96du6LfB7W5w1LdzT7uSl9tHQqQJWPv0VYzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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