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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0ddc9cf2df8fcb7cb54d87a7d9e6af78c4a88b550b1db25ac0ba24ff6b9c26' 
  AND token = 'bvpPrHsdTGM+IBiz0Nj6wTadWTkCk0n58FADJR3jPuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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