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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30da6c6ebf47572ffaef81458034f762c663dbfcb872d5b12d1afb2d6bd3a83d' 
  AND token = 'bDwAtCfaTHsdgKo2qgVBel9p6tajrXHIxuhKA0WkWJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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