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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636e52645d86363fe334fe1b7b9f32b6611ec7f1fa2b8d919db753b693212b69' 
  AND token = 'J0RlTeKPpPcwZxAeTRysx1EBHvHXfoSNLOC3u5lXdzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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