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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a996ea77504c4f17ff081928be67ed1c2ced50433782cca91bd060317f3dc2a' 
  AND token = 'GHE9kxob/x9ur4rTGF7yriBjPvjPiE1wFUsG+K3xfaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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