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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77efc316b99320669f0db13d5915a5ae2120f0975b7f779fd250c0166187dda6' 
  AND token = 'Bmy/sWEYL9OLpiWz5WzrQXU6MaZHHYN4Z8zu8uzH7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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