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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2670d1c79cf1e53211a6cd2c9b0387939707f8d7b8bc7ea8e099333eebc229c8' 
  AND token = 'RHHEp95biqE/pesHtqynvCJEoLgAhH2g8Vw8kKmiELc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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