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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b989547d6fbafae5d7fbaac0590138f6ab91e7719793dc6dc63d88062b46b4' 
  AND token = 't/5KLjlo9wVIKOf1xwyE7ELmuhPsaHRZj0NyS7hY8iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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