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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea24c93906e6194084da8d5d366602a6772f121c1c7f8e9d2eb6a882e51d3ce' 
  AND token = 'FCNo3nxN4A3JfV8zG+I20ZDS+86cor95Sz8t0GO9BQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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