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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658b5d4ef0bb3931b02fcd2c6cb2f00390cc952c4ffae0aba1b9c5a887dab11a' 
  AND token = 'HBixBpGdOWQffw0p0loGeFGTYS0+ugMlBjP/vqiWgnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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