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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac17464ad7e89aa43578a03185b66e0e98bcfba9454738aceffb180844b4b3a' 
  AND token = 'tDfT1JNN7nqhRmZqOEdl0kESHAc9DHkWnnxGsAMSmcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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