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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00921a73867ec7e1bb803771e4f2d1dc2397ae9b7ede5be08f61bfd0a14ab541' 
  AND token = 'E1qK7AY7gC95FjDmT/4B5opXub8g13wFg7s9mQAhEN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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