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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7551efc010ffea4b7fec33947fce4147de135c2de8a28d1423c6489af8396735' 
  AND token = 'XNni1b10B3pbd3Wofctay8q6ce97lygl/b9XGW0YW7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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