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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669518428798dd4bc4418773992b8bd80c65a8ccc8d347760906e54918bd9045' 
  AND token = 'C/MNkO69UoRUyWMyomw9soCx7hcVeoB2KHjqE4rs3TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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