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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7ea3c5676b793e2e0893cf8ded427e4930a195e0dc270907812057207534e7' 
  AND token = 'zdhBiryxWyZ1kJSbTY7uWET+CHuZj+z+G7rdNR/U/OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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