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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17aa2d5c09adf38ab16d108f981ae5ad2f173d83d650b40d9b73163638169185' 
  AND token = 'VntPM1KoSlj54za9nnh+W1tdK6p29o3JIcp8nBcacEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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