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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3ed37c5ea5affb1678f4e78a21b43093c0ab3516c5ec53524ebc9c7deadc52' 
  AND token = 'vkMO4KbwF7YlgmTQevAm8Vv9+3BtAJxhyknNb/lBiJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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