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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9387216fd7b1cc8101b0635023a2417004da37acaae44e71e5cd562f41695b57' 
  AND token = 'vI1ttOWaHOzTxd4F20nHAwDmbwmUkTGnetorHypH/hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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