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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89b646496f0f98505a5e86d565e74eff238fd702f0c9831b3cd9696879ee82f' 
  AND token = 'MIFZEKwjPMW0fEqH3dYY6WCMojUi2sxI07GawuuMv6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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