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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd529a83e6989af23713abf09a789a0a938fcc277d689a760a502e0aef6aac2e5' 
  AND token = 'BuWJ/NNt6eVEOXFYPR5Wh3qEsL5yaoGVtp9DogjHVcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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