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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec283b85d71cb6984b1fe96acb72908009d921b8ddbc41ae27226c669db1a360' 
  AND token = '7IFP9/uQvRePm26q+1zA+LcUYwRmSW7/Bjz/yn98KUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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