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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4f884823c79aa29c775707d02ceb161276ed39207c3d01daa7f0364ae5dbd7' 
  AND token = 'KQ1jo+AxLs5wPc06KXGfH0HyrayPHpHjfKQfkebjNKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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