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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974866f0ce722248c600d7e34591bf950c9a3a503fab57ccfcf5f963ff65e4d1' 
  AND token = 'uGNa55D5p5alSiCeA36L06IjIhSO5ohHilf5f8lOhWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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