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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b73eb7f953f819eeb10b61e644a070da36e18b69b0c51636cda37520c389ad' 
  AND token = 'zKRFnLgLLqMhlgrBlsBJt/CjqBzoBEdIfcc65fak/Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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