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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236b7642f9803361880bbe4ab22c4e34753489d3712e5f780b8257e1363dd55b' 
  AND token = 'W/2ee4BlXa+0yFBu2LHbRBbgiBu56nBMA+2bLo0O644=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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