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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbac6522ca64649745d7fffc445baa81587111cf01d9faa2f62b9f114f274e3' 
  AND token = 'yaTskKwr6aXyVQlRIYowfA1N1vY+7Ymccn0XZrFAb/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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