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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad3c22ffc9385ef72f8ef46e8e660d8f40a84360a842868f679ffbb886e0860' 
  AND token = 'vjLpL0wVpPQ/ZgeMsxRHDO/YFwzDqNfDDVjtVHWINzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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