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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eeca63146b53bee704592faddc36e07f76622e5b351eb48a4e8ea9569ff9619' 
  AND token = 'AI4LUWr9ASkvvDawM/T3lknPPpWY80Nm5WyKJj4Mjzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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