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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe90babfb1d26d5251f49d426e26c3fc766fea5a6bfe21a86d8368b657f3f64b' 
  AND token = 'tGFmu5HDz/3bu3SUM3GyMhzS0oPsGjNS4J17tvE+pg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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