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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4f8a12d0418aa337c39dea1a79fd6758e601b64dec811f5eebb71e4d035331' 
  AND token = 'PrjowQNsCmb+9qI2pCLHX4knzJp8FIDeuSjtbnlAZYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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