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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c58f8a66cc7854bac3f1f292eaf55a987d4ece530ad5c7f147d8d6a63e7a31' 
  AND token = 'c1+ntrh2dTNy6wCsA2J/74ajXjw8IhUMFs72C2s0eDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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