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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a38c824550c3c9d95c3007a0c02639cc88f37747a8a89dfee0ac1386ee7f887' 
  AND token = 'gd2LEry2JgtC2dXL/eNjYwcjgIf4w1KI55X849II7f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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