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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efb26f385f04bcbbb82faf927ad4130e7a0261e1c6395e15b4f42dc51f8eaa9' 
  AND token = 'FuQhIsyiCcJmsROaTh4ievvcALiZl/v4iZsiI0cViOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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