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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0455f6833b12a027274e51527537a849f843cd67f2456491637fd505073ddf1a' 
  AND token = 'G8e6y5RT/dodqwvBuoLOlQqyil+AYIQe2Dy72/Sb6mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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